Locomotive smoke-box



' (No Model.)

J. O. FARMER.

'LOGOMOTIVB' SMOKE BOX.

No. 275,812. Patented Apr. 17,1883.

FISH! l NVENT'EIRI WITNEEEEEI N. PETERS. PhclmLilhogmpben walhinglun. D cv UNITED STATES ATENT OFFICE JAMES C. FARMER, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO HIM- SELF, AND CHARLES E. FERREIRA, OF QUINCY, DOUGLAS A. BROOKS, OF BRAINTREE, AND CHARLES H. BROWN AND ADDISON A. REEVE, BOTH OF BOSTON, MASSACHUSETTS.

LOCOMOTIVE SMOKE-BOX.

SPECIFICATION forming part of Letters Patent No. 275,812, dated April 17, 1883.

Application filed August 9, 1882.

(No model.)

To all whom it may concern:

Be it known that I, JAMES C. FARMER, a citizen of the United States,residing at Providence, in the county of Providence and State of Rhode Island,haveinvented certain new and useful Improvements in Locomotive Smoke- Boxes; and I do hereby declare that the same are fully described in the following specification andillustratedin the accompanying drawings.

The object of this invention is to reduce the air-space in the smoke-arch of a locomotive, so as to create a stronger draft by reason of having a less amount of dead air within said arch to be carried off by the exhaust.

The invention is embodied in a boiler-shell having in its forward end a box or casing surrounding the lift-pipe or petticoat-pipe and the inner ends of the exhaust-tubes, so as to cut off the air outside of said casing from the influence of the draft, or, in other words, to materially reduce the air-space in which the exhaust acts and enforce the entrance of a correspondingly greater amount of heat through 2 5 the lines.

The drawings represent the best form in which I have contemplated applying my invention to locomotives as at present constructed, Figure 1 being a longitudinal verti- 0 cal section of the forward end of a boiler; Fig. 2, a transverse section of the same on line 00 00, Fig. 1; and Fig. 3, a horizontal section thereof at line 0 0.

My experience of thirty years as a locomo- 3 5 tive-engineer has developed certain imperfections in the working of the ordinary locomotive, which I have remedied. Among these difficulties is a deficiency in the draft, due in part to the large amount of dead air contained in the smoke-box as compared with the capac-' ity of the dues and the stack. My remedy consists in reducing the size of this box, and preferably .by placing within the front end of the boiler-shell a casing surrounding the ends of the series of dues, and inclosing also the exhaust-tips and pettieoat-pipe, but cutting 011' from communication therewith the remaining air-space within the boiler-shell, so that the air thus cut otf shall lie dormant.

In-the drawings, A is the boiler-shell; B, the base of the stack, and C the series of flues.

D D are the steam-pipes conveying live steam to the cylinders, and E E the exhaust-tips discharging into the base of the petticoat or lift pipe F. Attached to the flue-sheet G, just outside of the line of the series of fines, is a casing, H, constituting my improved smokebox, preferably made tapering at its sides and bottom toward the exhaust-tips, and at its top toward the stack, and serving in any case to cut off from the influence of the draft the air in the space between the casing and the walls and head of the shell A. A suitable man-hole, with door J, is formed in the box H.

By my improvement the draft is intensified and caused to respond more readily to the demands upon it, so that with a given consumption of fuel a greater amount of steam is produced.

I claim as my invention In a locomotive smoke-box, the casing H, serving to reduce the area of said box, substantially as and for the purpose set forth.

In testimony whereofl hereto atfix my signature in presence of two witnesses.

JAMES C. FARMER.

Witnesses:

A. H. SPENCER, E. A. PHELPS. 

